UV/IR - what do they mean?? Alright, I'm posting here in sheer frustration. I've read a bunch of papers lately which mention the ultraviolet and infrared in pretty strange ways - talking about a theory's UV-completeness or if it's UV-finite, IR modification, and so on. So - what does this mean? I've scoured the web and papers looking for a definition but I have yet to find a single paper bothering to define the terminology. Thanks!